Hello! On Tue, Jul 25, 2006 at 04:09:51PM +0200, Thomas Schwinge wrote: > How / why did this happen for you and why didn't it happen for other > people in the past?
well, I noticed the bug when I tried to use ssh's ControlMaster feature (see its manpage for details). Short, to reproduce it, start a ssh-master (`ssh -M $hostname') and then try to open a slave connection (just `ssh $hostname') to it. The slave process will then try to talk to the master process using a common named pipe (you can specify where it shall be written out using the `ControlPath' option, by the way). Then pflocal will crash as soon as you launch the slave-ssh process, i.e. as soon as it tries to send data to the master for the first time. I haven't tracked it down to the last detail (especially I haven't written any test code), but it seems to be related to sendmsg calls. At least sendmsg is the only call, which triggers control packages: ,-- [glibc]/sysdeps/mach/hurd/sendmsg.c | /* Send the data. */ | err = __socket_send (port, aport, | flags, data.ptr, len, | NULL, | MACH_MSG_TYPE_COPY_SEND, 0, | message->msg_control, | message->msg_controllen, | &amount); `-- ... the send call for example just provides NULL for msg_control and zero for msg_controllen. However a control package needs to be sent for the bug to occur (see `pipe_send' from [hurd]/libpipe/pipe.c). Concerning your questions why this hasn't shown in the past, well, probably nobody has tried to use sendmsg to send aucillary data through a (named) pipe so far. Cannot think of another reason. regards, stesie -- Stefan Siegl <[EMAIL PROTECTED]> _______________________________________________ Bug-hurd mailing list Bug-hurd@gnu.org http://lists.gnu.org/mailman/listinfo/bug-hurd
